Question

我需要迭代字段并按照另一列中的值计算少数列的总和。

对于ex基表是

C1 C2 C3 C4  C5
a1  2  3  4  q
a1  4  5  7  a
a2 34 56  6  e
a2  4  5  5  5
a3  3  3  3  4
a3  3  3  3  3

结果表应为

   c2 c3 c4
a1  6  8 11
a2 38 61 11
a3  6  6  6
   50 75 28

我能够迭代字段以获取每个字段的值，但却陷入了创建结果格式的二维矩阵的困境。我正在研究二维数组来实现这种情况。

Answer 1

在这里做了很多假设，因为这个问题非常不明确......

# table containing only the actual data
table = [[2,3,4,"q"],[4,5,7,"a"],[34,56,6,"e"],[4,5,5,5],[3,3,3,4],[3,3,3,3]]
result = []

# iterate through table[0/2/4/...] zipped together with table[1/3/5/...]
for (row1, row2) in zip(table[::2], table[1::2]):
    # add the first three elements of each row and append the results to our result
    result.append([c1+c2 for c1,c2 in zip(row1[:3], row2[:3])])

print(result)

输出

[[6, 8, 11], [38, 61, 11], [6, 6, 6]]

ArcGIS python 2.5脚本 - 通过迭代记录集来创建统计表

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